Related Content

State police say the tests compare residual oxygen isotopes in human hair and teeth with known levels in drinking water and could help them pinpoint where the girl lived.

Preliminary results suggest the child may have spent time in New England and other locations across the U.S., but so far police have not been able to draw any specific conclusions.

"The results are preliminary and require further study," a statement from the Suffolk County District Attorney's Office said.

Prior testing of pollen samples recovered from items on the trash bag in which the little girl was found suggested that she had spent a significant amount of time in the Greater Boston area prior to her death, the district attorney's office said.

The girl is estimated to be 4 years old. Her body was found on Deer Island on June 25 by a woman walking a dog.

While investigators still don't know the cause of her death, Massachusetts State Police still have not ruled out homicide.

Investigators said she was well-nourished and cared for until the time of her death.